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these questions requiere in depth explanatins. that is why i use online tutoring fo this. if you're interested , see my profile for details. ill be glad to offer services.

aaronq

5 years ago

theres 2 things you need to know for this problem
the stoichiometric ratio given by the balanced equation and the ideal gas law PV=nRT
There's several ways to approach the problem:
I would suggest you find the number of moles 12.5L of water are using the ideal gas law:
PV=nRT
then once you know that use the stoichiometric ratio
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aA + bB -> cC
lower case are coefficients and upper case are the species
so a ratio would be set up like this:
\[\frac{ moles of A }{ a}=\frac{ moles ofC }{ c }\]
you can then plug things in and solve for your unknown
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once you find the number of moles of methane you need, simply convert to mass (in g).
moles=mass/molarmass